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Finding the Fourth Proportional to 18,871.50, 28,306.50 and 4,831.38

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Solution

The fourth proportional to 18,871.50, 28,306.50 and 4,831.38 is: 7,246.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.50 : 28,306.50 = 4,831.38 : x
  2. Step 2: Convert to fraction form
    18,871.50/28,306.50 = 4,831.38/x
  3. Step 3: Cross multiply
    18,871.50x = 28,306.50 × 4,831.38
  4. Step 4: Simplify right side
    18,871.50x = 136,759,457.97
  5. Step 5: Solve for x
    x = 136,759,457.97/18,871.50
  6. Step 6: Final answer
    x = 7,246.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.